`dmvnorm.Rd`

Efficiently computes the density of observations for a generic multivariate Gaussian distribution.

`dmvnorm(data, mean, sigma, log = FALSE)`

- data
A numeric vector, matrix, or data frame of observations. Categorical variables are not allowed. If a matrix or data frame, rows correspond to observations and columns correspond to variables.

- mean
A vector of means for each variable.

- sigma
A positive definite covariance matrix.

- log
A logical value indicating whether or not the logarithm of the densities should be returned.

A numeric vector whose *i*th element gives the density of the
*ith* observation in `data`

for the multivariate Gaussian
distribution with parameters `mean`

and `sigma`

.

```
# univariate
ngrid <- 101
x <- seq(-5, 5, length = ngrid)
dens <- dmvnorm(x, mean = 1, sigma = 5)
plot(x, dens, type = "l")
# bivariate
ngrid <- 101
x1 <- x2 <- seq(-5, 5, length = ngrid)
mu <- c(1,0)
sigma <- matrix(c(1,0.5,0.5,2), 2, 2)
dens <- dmvnorm(as.matrix(expand.grid(x1, x2)), mu, sigma)
dens <- matrix(dens, ngrid, ngrid)
image(x1, x2, dens)
contour(x1, x2, dens, add = TRUE)
```